Equine Herpes Myeloencephalopathy (EHM) Updates:

NEW: EHV-1 Quarantine in Santa Barbara County

January 10, 2020: A 21-year-old Quarter Horse gelding in Santa Barbara County displaying neurologic signs and fever has been confirmed positive for Equine Herpesvirus-1. On January 9, 2020 the gelding was euthanized due to severity of signs. The index premises with two remaining horses has been quarantined with requirements for enhanced biosecurity measures including twice daily temperature monitoring. There has been no recent movement of horses on or off the property. CDFA will continue to monitor the situation.

 

EHV-1 Quarantine in San Bernardino County

January 6, 2020: No new cases. The one (1) exposed clinical horse on the quarantine premise that has not yet met the testing requirement for release has had the first negative test. Once an additional negative test is obtained at least seven (7) days apart, the horse and the premises will be released from quarantine. CDFA continues to monitor the situation.

December 19, 2019: No new cases. One (1) exposed clinical horse on the quarantine premise continues to test positive on nasal swab and has not met the testing requirement for release. The entire premise remains under quarantine. CDFA continues to monitor the situation.

December 9, 2019: No new cases. Four (4) of the EHV-1 positive horses have had two (2) negative tests seven (7) days apart. The other three (3) EHV-1 positive horses have not yet met the testing requirement so the entire premise is still under quarantine. CDFA continues to monitor the situation. 

November 27, 2019: One additional exposed horse on the index premise, a 12-year-old Quarter Horse mare, became febrile and has been confirmed positive for EHV-1. CDFA continues to monitor the situation.

November 25, 2019: One additional exposed horse on the index premise, an 11-year-old Paint stallion, became febrile and has been confirmed positive for EHV-1. To date, a total of four (4) horses have been neurologic and an additional five (5) horses have become febrile, all of which have been confirmed positive for EHV-1. Three (3) of the neurologic horses were euthanized due to severity of clinical signs and all other horses on the property are alive and recovering. CDFA is onsite and continues to monitor the situation. 

November 19, 2019: One additional exposed horse on the index premise, a 24-year-old Quarter horse mare, exhibiting neurological signs has been confirmed positive for EHV-1. Two additional febrile horses, a 22-year-old Paint mare and an 11-year-old Paint mare, have also been confirmed positive for EHV-1. CDFA is onsite to observe biosecurity protocols and isolation of positive horses.

November 18, 2019: One of the confirmed EHV-1 positive febrile horses on the index premise developed severe neurologic signs and was euthanized on Saturday November 16.  CDFA continues to monitor the situation. 

November 14, 2019: One additional horse, a 22-year-old Paint gelding, has been confirmed positive for EHV-1 myeloencephalopathy on the index premise. The horse was euthanized due to the severity of clinical signs.  Three additional febrile horses on the premise have also been confirmed positive for EHV-1. 

CDFA continues to monitor the situation. 

November 6, 2019:  A 13-year-old Quarter Horse mare in San Bernardino county displaying neurologic signs and fever has been confirmed positive for Equine Herpesvirus-1. The mare was euthanized due to severity of symptoms on October 29, 2019 and was confirmed positive on necropsy on November 5, 2019.  Twenty (20) exposed horses on the home premise have been quarantined with enhanced biosecurity measures including twice daily temperature monitoring. Any horse displaying clinical signs or a temperature over 101.5F shall be reported to the veterinarian for evaluation and potential nasal swab and blood sampling.

The positive horse has no epidemiological links to any other EHV-1 cases in California and there has been no recent movement off of the property. CDFA will continue to monitor the situation.